Re: [Barcode4j-users] Help!! setting width and height for a Code39Bean

[Kalyanaraman, K. (Dallas) <Ram...@Fi...>]

Appreciate your help. I was under the impression that it will re-calculate while generating the barcode. If we can add an optional validation flag to validate the configuration before generation, that will be cool. I had some minor challenges where the barcode would scan in some scan guns and not in others, reducing the wide factor fixed that issue. Overall, this is a great piece of software when compared to using the embedded object font generated by Microsoft WEFT.



-----Original Message-----
From: Jeremias Maerki [mailto:de...@je...] 
Sent: Tuesday, August 17, 2010 1:02 AM
To: bar...@li...
Subject: Re: [Barcode4j-users] Help!! setting width and height for a Code39Bean

Hi Kalyan

The most likely problem is that you're using bean.setModuleWidth()
twice:
1. bean.setModuleWidth(UnitConv.in2mm(1.0f / dpi)); 
2. bean.setModuleWidth(.05);

So this overrides what you've set in the first step.

0.05mm are below the 0.19mm that are required by many Code39 specs I've
found. See: http://barcode4j.sourceforge.net/2.0/symbol-code39.html

UnitConv.in2mm(1.0f / 150) = 0.169333

That's also a bit under the recommendation. If you lower the resolution
for the barcode bitmap to 120 dpi, you get a module width of 0.21mm. But
for this to work in print, you still have to make sure the barcode
bitmap is painted at 100% zoom (i.e. in its natural size). Otherwise the
bars get scaled up or down again which may result in scanning problems.

HTH

On 16.08.2010 23:23:03 Kalyanaraman, Kalyan (Dallas) wrote:
> I am trying to generate code39 barcodes using barcode4j.  When I resize
> the barcode using setModuleWidth and setBarHeight method, the generated
> barcode is not scannable from scan gun. Please let me where iam going
> wrong.
> 
> Thanks a lot!
> Kalyan
> 
> 
> 
>                   int orientation = 0;
>                 this.dpi = 150;
>                 Code39Bean bean = new Code39Bean();
>                 bean.setModuleWidth(UnitConv.in2mm(1.0f / dpi)); //makes the narrow bar
>                                                                  //width exactly one pixel
>                 bean.setWideFactor(3);
>                   bean.setMsgPosition(HumanReadablePlacement.HRP_NONE);
>                   bean.setBarHeight(5);
>                   bean.setDisplayStartStop(true);
>                   bean.setModuleWidth(.05);
>                   bean.doQuietZone(false);
>                   //orientation = setDimensions(request, bean);
>                 BitmapCanvasProvider canvas = new BitmapCanvasProvider(
>                         baout, "image/png", dpi,
>                         BufferedImage.TYPE_BYTE_BINARY, false, orientation);
>                 try {
>                   bean.generateBarcode(canvas, barcode);
>                   canvas.finish();
>                   //testSaveFile(((ByteArrayOutputStream) baout).toByteArray(), "writeFileTest"+barcode);
>                 } finally {
>                     baout.close();
>                 }
> 
> 




Jeremias Maerki